+ static glm::tvec3<int> FaceNormal(Face face) {
+ switch (face) {
+ case FACE_UP:
+ return { 0, 1, 0 };
+ case FACE_DOWN:
+ return { 0, -1, 0 };
+ case FACE_RIGHT:
+ return { 1, 0, 0 };
+ case FACE_LEFT:
+ return { -1, 0, 0 };
+ case FACE_FRONT:
+ return { 0, 0, 1 };
+ case FACE_BACK:
+ return { 0, 0, -1 };
+ default:
+ return { 0, 0, 0 };
+ }
+ }
+
+ static Face NormalFace(const glm::vec3 &norm) {
+ const glm::vec3 anorm(abs(norm));
+ if (anorm.x > anorm.y) {
+ if (anorm.x > anorm.z) {
+ return norm.x > 0.0f ? FACE_RIGHT : FACE_LEFT;
+ } else {
+ return norm.z > 0.0f ? FACE_FRONT : FACE_BACK;
+ }
+ } else {
+ if (anorm.y > anorm.z) {
+ return norm.y > 0.0f ? FACE_UP : FACE_DOWN;
+ } else {
+ return norm.z > 0.0f ? FACE_FRONT : FACE_BACK;
+ }
+ }
+ }
+
+ struct FaceSet {
+
+ explicit FaceSet(unsigned char v = 0)
+ : value(v) { }
+
+ bool IsSet(Face f) const {
+ return value & Mask(f);
+ }
+ void Set(Face f) {
+ value |= Mask(f);
+ }
+ void Unset(Face f) {
+ value |= ~Mask(f);
+ }
+
+ void Clear() {
+ value = 0;
+ }
+ void Fill() {
+ value = Mask(FACE_COUNT) - 1;
+ }
+
+ bool Empty() const {
+ return value == 0;
+ }
+ bool All() const {
+ return value == Mask(FACE_COUNT) - 1;
+ }
+
+ unsigned char Mask(Face f) const {
+ return 1 << f;
+ }
+
+ unsigned char value;
+
+ };
+
+};
+
+
+/// attributes of a type of block
+struct BlockType {